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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '89fc0e8a5a258a9b63d2881433a1c4c9c6971d8ab5e33b5982f9355c953581d0' 
  AND token = 'WvOi2/4aJjjSQ8TMKznZ9zY9i+asszOD6VkA1bXUBm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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