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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bb9e85a786ea445b71cfd65743e31a907d4d34ee4944b4af6d43627e6f28a17b' 
  AND token = 't4KW+wXtiUyX7AQfD+VC/ibdcVn2buOpsSA9UXIsa50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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