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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9667eb3396c2e3a8ed214fc0c871b7fe7bcebe4dbad3362bfaac11150c340cd7' 
  AND token = 'ZoO6S/VnrNA0vTg431E+eXrky83gWNVas4onnTt9DD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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