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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e0a10247d0513a187b8340556545ee2a7b9a2d2a7793aecc7db7e68952e0b2f7' 
  AND token = 'IBXv9A5DGB1e+xqcizoq1Y++O8I6EC/XlTh8h/5WU/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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