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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aea6bf2d9217431642338370b30f4461dc416f90f57b3aeb86c7b729270b1964' 
  AND token = 'BFOlNR45HsmqYOEJLZGcSWPfqPkl0u3l4bW3AyNcHlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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