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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '028122ccf66c1b34057a5b4b3d7c17d4197745283ef413fda7f4574478afae84' 
  AND token = 'Krt/JnkxtzjlSp6w6G5JjRIBc3i2DotEs3okEM9jJIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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