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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '36f3b92217400d8ab6e56de051eb14b1b992b16691eb11b3950e760b74ea1c1f' 
  AND token = 'kORl5A0T4rb9MTYNxwyedu2j4tyntZS/GY63NYAMCHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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