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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1f854bbc50cd08c63c4f551d931eb753e4d61cf2793a05974da67f892b426be7' 
  AND token = 'myfLqptzAVpbbSDFNevOWnh6CmA4LyP001ltgtfTq5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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