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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '695c2b07d9f00da3464e89ab9a1af2db9fe1d412cef610064d8566d73f299f1c' 
  AND token = 'Zr199RkPeBzyqGYC8X+FHWbAypQ5r9BrPqsDtp8aNyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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