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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fbee0c107a2cc1e1b6ce340847b2792cf2a10dc4bed1cc2f56fcc3859507db6c' 
  AND token = 'uWpdEOlm87623c0c/8ghmFshI+OKKTSXufSRAoz8Zbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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