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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a5040181e59e9aaee2241edc233122b7f505fcca3927b2e3502a94c9a396df26' 
  AND token = 'OUK7ZnNLxS8ky4FzGDhJyXdHGUeywN9XZ7L5puVd+yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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