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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a9fcc5a4d1ebdeb4e4276773adc8424e4e0a272a114e14d2715fa29d4f453c61' 
  AND token = 'dZP32PDdiNyMiCUeYJ6x9aOxJr+AinApHJR0a6v2ACg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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