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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'db62e0841503dbf4ed4318582a8a7a107f620519ed5f6aea358823488431d1d7' 
  AND token = 'fujX1Q1+eRtieIRIQK0QeacWu/Yhw7WE0VW+pEpGBQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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