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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '27d15ce1760ef7136d23fe81ee1b9a2c82e6b784ab7f4e46b95781782ac4488a' 
  AND token = 'bfIzsxZ2cXQ8TGO/uAaqiTt6N5qbSJSIKSfxBTWNRg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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