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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e6134ecf4943012dc341fdf1df93208b298799959d7621b73407b05e9974f914' 
  AND token = 'yoRJy918W61wJJNTlKsepGGSy0B99brn6P4/k9aGXug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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