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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c60766b5f6fb4f25f959b5f92ccfd97f2a82738387c929a1cd5ceeca38bef7ec' 
  AND token = 'jSkBRxNFIMrZwt9CkaELoy7q+9UesxaAwXqDoxdU4+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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