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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6e3dc9f7764eef511c399d360e4664b69c8195d2e86669b1d0dfbec5d8d71a52' 
  AND token = 'gYJA5xSg+8/VXZ5WVnCiz+x2w6iggDR0tl9BoogyJzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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