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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '73649aa2c9bf7e307803069e81aa783912418fd246d5da98cae9f89b6c381ca6' 
  AND token = '3jFl0+A61DY0DCBRdwLG+Dt7fCHdQBb8afF1U7KBCf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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