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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'af8cc29bd8e47c6f6a4b29255c8726807f47bcf928331cc04f3e6188b5603a52' 
  AND token = 'i1NxOuYn4qFwMKxygdYjkx9SsTCrlKy3O8ksxuWHlPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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