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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0fbe85918471b41d0391354f6cc9bc954886f02794523d628201e5037957adbe' 
  AND token = 'e0Pkn/9Ik3qLO3T285Eqe4RCsV4I0CPQ4o7x7lBauQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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