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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '88e063fe4cdc06a5a4ec3305fb8191414d58a93268cc262c8219eedcb5d1933e' 
  AND token = '/Kn9XJwMzgZYMr8gvyq6Er31fPwMdTbuTfn6ht8KmJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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