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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4932597257c1a0a5a4d211287a934c80752142783739df6a614941462a737367' 
  AND token = 'iYrTLCvSON7qgCLNibqQ0i3yQynNbAF4/6vdB5trbJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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