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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '095f74117dcc7594a88010cb9ec7d752384b4eca04750558901c32fccc81ede8' 
  AND token = 'CJc6H8FjdmzzGbtIw0Y52y8Kkyc0D/8S2KBIu4DeUWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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