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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2e6817ce17ecee9b7c69376f4393f13c87a5d61ec7a971965d110b1f39d1ab8a' 
  AND token = 'eXPZ/aEnDCe1oV4XomZkR+fMxIPNNexgJbQMfCJKFaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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