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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b88fa58dcd0d3ffb5599fdcc8266eae4421871b72664bef181d9a78af8e83902' 
  AND token = 'l/t9ad8pFnf6pzKkOp+OfGh0jEGaDHQcINIROggf4jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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