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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2cc8134d066c4636eb1afa94d9abdddfdebf7b1dd9a19d2ef5c305a8f2e593e9' 
  AND token = 'Vv8dKHIVhZKBVQnqhiCf9ydED7RctFJ2SZIq1q6XKuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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