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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '405e387e30e6230e11bfbb02250b36d1991158ce44d43954ae9305784630db08' 
  AND token = 'Fwr0A2GOXp+Sqd6gDv2PhjI+/hF17byl5eqRrnFlblw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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