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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '054a77ae16ae881c8c2fee822f455c3d63269331db54365644f80c17dc9a7966' 
  AND token = 'n8QdZN723LEd9zpKoHXzw9kCi3tVHJzL8vbxUUyO4pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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