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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6fecce252251718d332edca343d7c7c2a6d5e1e3771e46fa025e4edc7533e0f3' 
  AND token = 'piqcffFrLFVCJFAvjcF+OR2ryynSNDWpWhIfWHI6Szs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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