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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'be13893a864c35091caa2733a363ffab6c80e21d1ac0ebfb192732344af35ea6' 
  AND token = 'Ju8v5Gm/6//daVDPEVo8DkjrkfM2LYfn2x+6ZWP2fP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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