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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9cb8ead8e677533a0479f82ff4955aaad7d5f582c27ad05680c2a31c2997bab2' 
  AND token = 'ggalMhstzdk41NQT/ZHy5bfDW6Ooe6hAjX1wk2wbGhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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