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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '72ab48c14a30eec5ec791d50171b30751fd6bcaa680abebb5d39dda8ef8795b6' 
  AND token = '8yfzOHEhaAQgDMl1KeJPK/5ohXyZIx06ZYxWRMRQCik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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