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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aaa33b70e5baa49897d6f2e02bb92992f466ce3d031810d345c735b4092e7ddb' 
  AND token = 'kLdU4akGL5uP8pIeJYh3pQgmtgTXmFnfx0DbP6SIlP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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