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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ad35f11a2949e6ba76fa88b689e149a1384d0e9df119c2c378553910145dd7fb' 
  AND token = 'nqYn9/LuBlHIWj0mPY4NeNHBcilvzZ9yX7nyBG6tcxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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