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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '80f186e12e1ef0cbc391e295ca28aa49a8df5f3c34bc7524203ff648d28198cd' 
  AND token = 'mY5IrS3H0Carr82oIl4R76GyW41h+VfzP4nLbr1cS7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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