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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7abd6b328e4534405c25e396e7b500e3842b471198bef2a7bff77480b56f4efb' 
  AND token = 'p2WD3jVG0wrCNZ0CTye+LIf4OHTjY51EOYAkUakBPXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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