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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e0e03c78eeb39c54495a0695957b1996ce03fa36609f51a29e506daf1ddcf9d3' 
  AND token = 'wf5n2ZvDKkaJnxXH5YDQ3hcx3Odaf9c9Y3zYhzoMvFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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