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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '80d661f3ec98f7ea44d4e6631dda9c1f7b8c4f8091410a096ca4dbbee28842bc' 
  AND token = 'PFPTqdpQo+w5VB6viNR4eOJT+dP29qAz3YuUSl9PuxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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