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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f86620bf6345934b442e20df2902f3f8f7302440e6d3c7c5e2b8da8db0c4e176' 
  AND token = 'EmWM206vPKtkbExwhCNN14fYA9tERv98kaz1LtG6WjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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