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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '89e5ebc82c9a7c137bad584c2b84e4c809cda1814e617271e26e729f64acce11' 
  AND token = 'S7/Nh5p9y8upAA0Qwi813fqmDpBT5HipUtnJofARH9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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