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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '118b91b466be448f2ecb4a53660d9fbae804db554f02d326d479dc34bece7c5e' 
  AND token = 'PgdXxlruk6NWeRUhFRD8z8zb8ETrIcsM0/1HZW/RP04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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