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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '14dd207b3bbd10d4cf4461a774f242d2734b762638de9ecf56555f4a1b86dfb1' 
  AND token = 'VbiIdNQdTJhCkVAzyJE9cs6SMZ6WpmnVWIE9cA9m7Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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