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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cf93debdf65b07b8516406ca8e13ff92d952c81aa214358aaab81c8944eebd7e' 
  AND token = 'JZ/AYafLnj4sBn1JMMvbmoKbfbtSZLWTbMa7bAaNde0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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