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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a58404c21cc74906f9108013ed4b1193ca514a4c5da9f49fb44a6375cc14c365' 
  AND token = '4TWdiCejpyWq9gq7lbXCP1maNS9ezxIK964l2CEgGO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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