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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd11c194d238b941af53edd39f40945f0b8c2adf338b4ea2b8b8614d893f0cf4e' 
  AND token = 'notjczWR6Jo8Qkfb0L27rJEasLu0arKVOSLjCeOnMVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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