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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '12708966966a6bdd763e22b6e57722abb6ccdfbddd587a8cad64d7eb4d322c2a' 
  AND token = 'Gu0u0Wth7a6fG/t/8loZWYRAeVtseBh60fAFFztXMto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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