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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ebdd974515264d52af3023ce135f7409259ed54be26fd838bf30a9769214acf8' 
  AND token = 'nkXF9YU7xLuRo0806oQq6MRk/r/BWErKcWmRk1qNRWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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