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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0e6964f5c02ab1d2db69dcfbdef51185d0ec076cead5d27d358a5b3df94211a0' 
  AND token = 'CS0MnX4awIY/r4v87KUF21qzdeyu7HgCNkaZc6FEBN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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