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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4dc8e2bad6aae663822adfa2b9d20383c24cffb34f1892ff688ea0b4e0b9b4a2' 
  AND token = 'ZNCHrwM7A6n76ICj38lfOhiQmGxIbv9YL7GE8oLYhFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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