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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '51212397907d30917e880777ac9695ef462e43b62fa7a9fe5bdfd47eb28ec102' 
  AND token = 'p7wgG2PABeiGf3h2f70P1JHilHrvChj6W1z7m7K7mUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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