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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a269b2a0972cb2e8c540ee72bdfc2482dcc3049f4ec69217b069ab9959cd78c9' 
  AND token = 'LCjc0EYRN3Gnfr9s5zJ7iU2PFHdr1sGSLAbDrjC6GEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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