Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0a1b66d2eed2a118885efeb46946594a379cfa2e9c538312c9d26ba873426a' 
  AND token = 'UfIyYIysoz7PkLlLT3TXPmCx3RFT/bVSShOcaHCJslc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}