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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd4c303c2a6c2873b6c2124c270c64451ec95e1eb28f7fb691207e75fbafeaa20' 
  AND token = '8u7iJ0kfgB0gVvl4tJGLTYFBU0drcbqqKlK7DVwtR2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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