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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8fd7b6a4f598712a5b6dc69e24c55e2c91db0fbf8778e7741595f3da95a012c6' 
  AND token = 'Cv9hDXG8KtG4l6GTz8O0OBcbJDd0u8z+MmYELG37XlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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