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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f67400f2523402aac9482f56492d640cc887bbeb513f71ec227bd4741dc8ea6a' 
  AND token = 'SNACiADONamJe8e8Pp7cz7ui9Qi2/7jTc5gtlLb5dWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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