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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '995bd2af4b01e2efc6a7173f123253dfc9b2ff46dbaf5738cc008ab4b57343d6' 
  AND token = 'LYf0y74rUQbv8AhtvfEar5BjPz1P02i5O6GNILWi8zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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