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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8721cac34a7817ab8623a933a8717aba889f31b9ae1c02d803444fc3e36ab97c' 
  AND token = 'p2hpLZJ24EWyBvBSa6hhbqNvQB3zATE5bJZtt6Tf1PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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