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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '180722e5516fb8278ff189764a61e759943521cc7f23c083102b68cde09af5cd' 
  AND token = 'i1P4VDcdvC/FG97V6b0abeY0jcKHh49y22FLYzkWU2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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