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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '829d613db2426a13ab0bff45269ca297e1e7ec4702b851826c8e6b0ada10f3a6' 
  AND token = 'ps1SEV+VhS78/haPC0IXz1ea47Rh9uYfuto1+Xx5yHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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